Igcse Model Questions Vol1 2022 Biology Question 10

Practice essay / theory question 10 from the 2022 Igcse Model Questions Vol1 Biology examination. This question covers Hardy–Weinberg equilibrium, Allele and genotype frequencies, Population genetics .

Igcse Model Questions Vol1 2022 Biology Essay / Theory

Topics: Hardy–Weinberg equilibrium Allele and genotype frequencies Population genetics

Question 10 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • essay

In a large isolated village, a recessive allele ‘d’ causes a metabolic disorder that is clinically evident only in homozygotes (dd). A recent health survey of 10 000 villagers recorded 30 individuals with the disorder. Blood tests on a random sample of 200 unaffected villagers revealed that 38 of them are carriers (heterozygous, Dd).

Question Parts

( a )

Calculate the allele frequency of d in the population using the data from the random sample. Show all steps.

( b )

Using the Hardy–Weinberg principle, calculate the expected number of affected individuals (dd) and carriers (Dd) in the whole village. Compare these expected numbers with the observed data and discuss two possible reasons for any discrepancy.

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About This Question

This is Igcse Model Questions Vol1 2022 Biology Question 10. It is one of the essay questions from the 2022 Igcse Model Questions Vol1 Biology examination.

The question covers Hardy–Weinberg equilibrium, Allele and genotype frequencies, Population genetics .

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